Improvement in sizing compositions for yarn, paper



e6. COMPOSITIONS,

COATING on msnc J hereby declare that the exact description of my Q'UNITED STATES Cross Reference mss/ PATENT- OFFICE.

Jenn LEIGH, on MANCHESTER, NGLA D.

Speoificat ion forming part of Letters Patent No. I 7,381, dated May 26, 1857..

,ro-hu whom it may concern:

.-,Be it known that I, JOHN LEIGH, of the of Manchester, in the county of Lancaster and' Kingdom of England, surgeon, being a subject'otf victoria Qucen of the said Kingdom,

have invented or discovered the use or application of a certain substance or s'ubstauccs'in the sizing, stifi'euing, or otherwise preparing cotton, linen, or other yarns and woven fabrics, and in the manufacture of paper; and I following is a full and said invention or dis; covery. 1 I Mysaid invention consists of the applica- -tion of silicate of soda silicate t 10 to thesiiing, dressing, s 1 emug'for otherwise preparing yarns and woven fabrics, and in the manufacture of paper as a sizing substance, instead of flour, starch, or. other substances hitherto used for those urposes, which silicates I use eitheralonel'g in combination with sulphate of barytes, Hour, stareiiarttnersimi ar su stances.- esaiil silicates may be prepared by fusing together in a suitable furnace fine pure white silicious sand, quartz, or simi caustic soda or carbonate of lar matter with soda, caustic potash or carbonate of potash, in

proportions varying with the solubility or alkaliuity of the silicates intended to be obtained. A little charcoal may be mixed with the sand or 'quar z an e said'carbonates, if

desirable; but care must be taken that no lime or alumina bepresent in undue quantity, as it would render the resulting glass less soluble.

The proportions for making the silicate of potash may be about equal weights of clean sand or'quartz and dry carbonate of potash,

.f-Iand for the silicate of soda about equal weigh ts of clean sand and soda-ash, containing about fiftyper cent. of real alkali; but these proportidnS may be varied according to circumstan- .=qes,

or to answer the purpose for which the respective silicates are intended; but as they are articles of commerce it is unnecessary for me to describe their mode of manufacture more particularly.

For. the application of the silicates to the before-mentioned purpose or purposes I dissolve them by steam or hot water in suitable vessels made of copper or clean iron, or other suitable material. To the solution thus obtained I add so much of a solution of hypochlorite of lime or soda commonly ca led stirrel during the whole time of the addition. I then cautiously audslowly pour in so much of a iegLacitl (and I prefer to use the sulalkali that may exist in the silicate of soda or potash. I add the diluted acid \vith brisk agitation until flocksbr'flakesbf silica begin to separate from the mixture; but it the quantity of free alkali be induce the acid, although I prefer to do so. I

thus prepared into clean boilers made of copper or iron, and boil it down to the strength required, which will vary with the weight or tion may be effected in the sizing-trough or sizing-vessel, which ought to be made of copper, clean iron, or other suitable material. A quantity of tallow or other rease or ing with flour- )aste.

In using the said silicates in the manufacturie of in )er it may either be mixed with the ii iii size after the paper is made to give it additional body or strength. y

I claim as my invention or discovery+ The sizing and dressing of yarns, woven goods, and paper by means of the alkaline silicates as set forth in the specification.

JOHN LEIGH.

In presence of-- E. J. HUGHES,

Patent Agent, Manchester. F.1'1DEBTON,

Assistant Surgeon, Manchester.

Examiner bleachin -li nor) as may destroyauy brown tint and render colorless the dissolved sili-. cates.-, The liquor must be briskly agitated or phurrc acid of commerce diluted with about erg t parts of water) as shall take up any free considerable it may not be necessary to intropour the solution of silicate of soda or potash quality of the cloth to be manufactured, and

be employed. The said reduction of the solu- -qgalsmay be introduced at the same time in o e trough or sizing-vessel, as is often done in size-preparptory process or used as I 

